BELLET DAVID F
SC 13G, 1997-07-31
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934
                         (Amendment No. _____________)*

                        Digital Generation Systems, Inc.
     ----------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock, No par value
     ----------------------------------------------------------------------
                         (Title of Class of Securities)

                                    253921100
                      -------------------------------------
                                 (CUSIP Number)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page. 


The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                        Index to Exhibits is on Page 17

                                  Page 1 of 18
<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 2 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Glynn Capital Management
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       California
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                       
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          1,029,666 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.8%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 3 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Crown-Glynn Advisors, Ltd.
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]

- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          308,375 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       308,375 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       308,375 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       2.7%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 4 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Crown Advisors, Ltd.
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          565,200
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       565,200
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       565,200
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       4.9%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 5 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Crown Capital Management, Ltd.
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          256,825 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       256,825 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       256,825 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       2.2%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 6 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       John W. Glynn. Jr.
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       30,000 shares of Common Stock                           
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          1,029,666 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             30,000 shares of Common Stock
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,059,666 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       9.1%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 7 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Darryl Messinger
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          1,029,666 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.8%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 8 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Steven Rosston
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          1,029,666 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,029,666 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.8%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                                Page 9 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       David F. Bellet
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       20,000                                                   
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          565,200 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             20,000
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       585,200 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       5.0%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                               Page 10 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Chester A. Siuda
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          565,200 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING            0
    PERSON   
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       4.9%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                               Page 11 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Margaret S. McNamara
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          565,200 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       4.9%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                       13G
CUSIP No. 253921100                                               Page 12 of 18
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
       
       Jeffrey S. Hamren
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       U.S.
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER                                        
                                                                                
                       0                                                        
                  --------------------------------------------------------------
  NUMBER OF       6    SHARED VOTING POWER
    SHARES        
 BENEFICIALLY          565,200 shares of Common Stock
   OWNED BY       --------------------------------------------------------------
     EACH         7    SOLE DISPOSITIVE POWER
  REPORTING       
    PERSON             0
     WITH         --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       565,200 shares of Common Stock
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_|

       
- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       4.9%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

Item 1(a)  Name of Issuer:     Digital Generation Systems, Inc.

Item 1(b)  Address of Issuer's Principal Executive Offices:

           875 Battery Street, San Francisco, CA 94111

Item 2(a)  Names of Person Filing   See cover pages.

      Relationship of filing persons:
           Glynn Capital Management, Crown-Glynn Advisors, Crown
Capital Management and Crown Advisors, Ltd., are Registered Investment Advisors.

           Glynn Capital Management is investment advisor to Glynn Emerging
Opportunity Fund, a California limited partnership, Glynn Buckley Investments, a
California limited partnership, McMorgan Fund II, a California limited
partnership, and Glynn Investments, a California limited partnership.

           Crown-Glynn Advisors is investment advisor to Crown Associates III, a
Delaware limited partnership, and Crown-Glynn Associates, a Delaware limited
partnership.

           Crown Capital Management is investment advisor to The Crown Trust, a
New York Trust.

           Crown Advisors, Ltd., is a sub-advisor to Crown-Glynn
Advisors and Crown Capital Management.

           John W. Glynn, Jr., David F. Bellet and Chester A.
Siuda are Managing Directors of Crown Capital Management and
Crown-Glynn Advisors.  John W. Glynn, Jr., is sole owner of Glynn
Capital Management.  David F. Bellet and Chester A. Siuda are the
owners of Crown Advisors, Ltd.

           John W. Glynn, Jr., David F. Bellet, Chester A. Siuda,
Jeffrey S. Hamren, Daryl Messinger, Steven Rosston, and Margaret
S. McNamara are General Partners of Crown Partners III, L.P., a
Delaware limited partnership and Crown-Glynn Partners, L.P., a
Delaware partnership.  General Partners of Crown Associates III,
L.P., and Crown-Glynn Associates, L.P., respectively.

           Crown Associates III, L.P. owns 207,770 shares of common stock,
Crown-Glynn Associates, L.P. owns 100,605 shares of common stock, The Crown
Trust owns 256,825 shares of common stock, Glynn Emerging Opportunity fund owns
77,500 shares of common stock, Glynn Investments owns 24,000 shares of common
stock, Glynn Buckley owns 27,700 shares of common stock, Glynn Venture III owns
89,166 shares of common stock, McMorgan Fund II owns 51,400 shares of common
stock.


                                  Page 13 of 18
<PAGE>

Item 2(b)  Address of Principal Business Office or, if none Residence:

           As to the following filing persons:
           Crown-Glynn Associates, Limited Partnership
           Crown Associates III, Limited Partnership
           Crown Partners III, L.P.
           Crown-Glynn Partners, L.P.
           Crown-Glynn Advisors Ltd.
           Crown Capital Management Ltd.
           Crown Advisors Ltd.
           Chester A. Siuda
           Margaret S. McNamara
           Jeffrey S. Hamren

           67 East Park Place
           8th Floor
           Morristown, NJ  07960

           As to the following filing person:
           David F. Bellet
           60 East 42nd Street, Suite 3405
           New York, NY  10165

           As to the following filing persons:
           Glynn Buckley Investments, L.P.
           McMorgan Fund II, L.P.
           Glynn Capital Management
           Glynn Emerging Opportunity Fund
           Glynn Investment, L.P.

           Glynn Venture III
           John W. Glynn, Jr.
           Steven Rosston
           Daryl Messinger

           3000 Sand Hill Road
           Building 4, Suite 235
           Menlo Park, CA  94025

Item 2(c)  Citizenship:        See cover pages

Item 2(d)  Title of Class of Securities:  Common Stock, no par value

Item 2(e)  CUSIP Number:  253921100


                           Page 14 of 18
<PAGE>

Item 3.    If this statement is filed pursuant to Rules 13d-1(b), or
           13d-2(b), check whether the person filing is a :

           (a)  Broker or Dealer registered under Section 15 of the Act,

           (b)  Bank as defined in Section 3(a)(6) of the Act,

           (c)  Insurance Company as defined in Section 3(a)(19) of the Act,

           (d)  Investment Company registered under Section 8 of the Investment
                Company Act,

           (e)  *Investment Adviser registered under Section 203
                of the Investment Advisers Act of 1940,

           (f)  Employee Benefit Plan, Pension Fund which is subject to the 
                provisions of the Employee Retirement Income Security Act of 
                1974 or Endowment Fund; see 13d-1(b)(1)(ii)(F),

           (g)  Parent Holding Company, in accordance with Section 240.13d-1(b)
                (ii)(G),

           (h)  Group, in accordance with Section 240.13d-1(b)(1)(ii)(H).

           --------------------
           * As to Crown-Glynn Advisors, Ltd., Crown Capital Management Ltd. 
             and Glynn Capital Management and Crown Advisory Ltd.

Item 4.    Ownership:     See cover pages.

Item 5.    Ownership of Five Percent or Less of a Class: Not applicable.

Item 6.    Ownership of More Than Five Percent on Behalf of Another Person:   
           Not applicable.

Item 7.    Identification and Classification of the Subsidiary which Acquired 
           the Security Being Reported on by the Parent Holding Company:   
           Not applicable.

Item 8.    Identification and Classification of Members of the Group:    
           Not applicable.

Item 9.    Notice of Dissolution of Group:    Not applicable.

Item 10.   Certification:

                By signing below I certify that, to the best of my knowledge and
           belief, the securities referred to above were acquired in the
           ordinary course of business and were not acquired for the purpose of
           and do not have the effect of changing or influencing the control of
           the issuer of such securities and were not acquired in connection
           with or as a participant in any transaction having such purposes or
           effect.


                                  Page 15 of 18
<PAGE>

                               13-G SIGNATURE PAGE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Dated:       February 14, 1997

CROWN-GLYNN ASSOCIATES, LIMITED           /s/ John W. Glynn, Jr.
PARTNERSHIP                               --------------------------
                                              John W. Glynn, Jr.*


By  Crown-Glynn Partners, L.P. as         /s/ Steven Rosston
General Partner                           --------------------------
                                              Steven Rosston


CROWN ASSOCIATES III, LIMITED             /s/ Daryl Messinger
      PARTNERSHIP                         --------------------------
By Crown-Glynn Partners III, L.P.  as         Daryl Messinger
      General Partner                 


CROWN PARTNERS III, L.P.                  /s/ David F. Bellet
                                          ---------------------------
                                              David F. Bellet


CROWN-GLYNN PARTNERS, L.P.                /s/ Chester A. Siuda
                                          ---------------------------
                                               Chester A. Siuda


By  /s/ David F. Bellet                   /s/ Jeffrey S. Hamren
- ---------------------------               ---------------------------
        General Partner                       Jeffrey S. Hamren


                                          /s/ Margaret S. McNamara
                                          ---------------------------
                                              Margaret S. McNamara

CROWN CAPITAL MANAGEMENT LTD.

CROWN ADVISORS, LTD.

CROWN-GLYNN ADVISORS, LTD.


By /s/ David F. Bellet
- ----------------------

- ------------------------------
      *  Individually and on behalf of Glynn Capital Management,
         Glynn Emerging Opportunity Fund,  Glynn Investment L.P.,
         GCM Pension, Glynn Buckley Investments, L.P., McMorgan
         Fund, L.P.


                                  Page 16 of 18
<PAGE>

                               Index to Exhibits
                               -----------------

Joint Filing Agreement............................................. Page 18


                                  Page 17 of 18



                             JOINT FILING AGREEMENT

     Each of the undersigned hereby agrees that the Schedule 13G filed on the
date hereof has been filed on behalf of each of the undersigned. 

Dated: February 14, 1997

CROWN-GLYNN ASSOCIATES, LIMITED           /s/ John W. Glynn, Jr.
      PARTNERSHIP                         --------------------------
By  Crown-Glynn Partners, L.P. as             John W. Glynn, Jr.*
      General Partner            

                                          /s/ Steven Rosston
                                          --------------------------
                                              Steven Rosston


CROWN ASSOCIATES III, LIMITED             /s/ Daryl Messinger
      PARTNERSHIP                         --------------------------
By Crown-Glynn Partners III, L.P.  as         Daryl Messinger
      General Partner                 


CROWN PARTNERS III, L.P.                  /s/ David F. Bellet
                                          ---------------------------
                                              David F. Bellet


CROWN-GLYNN PARTNERS, L.P.                /s/ Chester A. Siuda
                                          ---------------------------
                                              Chester A. Siuda


By  /s/ David F. Bellet                   /s/ Jeffrey S. Hamren
- ---------------------------               ---------------------------
        General Partner                       Jeffrey S. Hamren


                                          /s/ Margaret S. McNamara
                                          ---------------------------
                                              Margaret S. McNamara

CROWN CAPITAL MANAGEMENT LTD.

CROWN ADVISORS, LTD.

CROWN-GLYNN ADVISORS, LTD.


By /s/ David F. Bellet
- ----------------------

- ----------------------------
      *  Individually and on behalf of Glynn Capital Management,
         Glynn Emerging Opportunity Fund,  Glynn Investment L.P.,
         GCM Pension, Glynn Buckley Investments, L.P., McMorgan
         Fund, L.P.


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